Update to the backend and new Screen.

Features:
- Added a new settings page
- Laid out some backend stuff to integrate some new features
- prepared backend to include an option to have the previous values also displayed when updating them both screens where you may change configuration of the microcontroller

BiogasControllerApp-V2.2/bin/lib/comport_search.py

@@ -0,0 +1,22 @@
+import serial.tools.list_ports
+
+
+class ComportService:
+    def __init__(self):
+        self.__comport = []
+        self.__import = []
+        self.__working = []
+
+    def get_comport(self, special_port=""):
+        self.__comport = [comport.device for comport in serial.tools.list_ports.comports()]
+        self.__pos = 0
+        if special_port != "":
+            self.__working = special_port
+        else:
+            while self.__working == []:
+                self.__com_name = serial.tools.list_ports.comports()[self.__pos]
+                if "USB-Serial Controller" or "Prolific USB-Serial Controller" in self.__com_name:
+                    self.__working = self.__comport.pop(self.__pos)
+                else:
+                    self.__pos += 1
+        return self.__working